AN APPRAISAL WELL on the deepwater Tweneboa discovery offshore Ghana has intersected a large hydrocarbon column, according to operator Tullow Oil.p>AN APPRAISAL WELL on the deepwater Tweneboa discovery offshore Ghana has intersected a large hydrocarbon column, according to operator Tullow Oil.
Tweneboa -2 was drilled by the semisub Atwood Hunter in the Deepwater Tano block to an interim sub-surface depth of 3,860 m, in a water depth of 1,321 m. The location is around 6 km southeast of the Tweneboa-1 discovery. Analysis of drilling, wireline logs, and reservoir fluids confirm this is a major oil and gas-condensate field, Tullow claims.
The well encountered a gross reservoir interval of 153 m containing 32 m of net hydrocarbon pay in stacked reservoir sandstones: this comprised a 17-m oil bearing zone below a 15-m gas-condensate bearing zone.
Tullow adds that a combined hydrocarbon column of at least 350 m has been established between the lowest known oil in Tweneboa-2 and the top of the gas-condensate at Tweneboa-1, proving a highly prospective and extensive turbidite fan system which will need to be evaluated through further wells.
Following completion of logging operations, Tweneboa-2 will be deepened to test added exploration potential beneath the Tweneboa structure. The well will then be suspended for future use appraisal/development programs.
